diff --git a/src/panels/lovelace/entity-rows/hui-lock-entity-row.js b/src/panels/lovelace/entity-rows/hui-lock-entity-row.js
deleted file mode 100644
index af9b84f131..0000000000
--- a/src/panels/lovelace/entity-rows/hui-lock-entity-row.js
+++ /dev/null
@@ -1,80 +0,0 @@
-import { html } from "@polymer/polymer/lib/utils/html-tag";
-import { PolymerElement } from "@polymer/polymer/polymer-element";
-import "@polymer/paper-button/paper-button";
-
-import "../components/hui-generic-entity-row";
-
-import LocalizeMixin from "../../../mixins/localize-mixin";
-
-/*
- * @appliesMixin LocalizeMixin
- */
-class HuiLockEntityRow extends LocalizeMixin(PolymerElement) {
-  static get template() {
-    return html`
-      ${this.styleTemplate}
-      <hui-generic-entity-row hass="[[hass]]" config="[[_config]]">
-        ${this.lockControlTemplate}
-      </hui-generic-entity-row>
-    `;
-  }
-
-  static get styleTemplate() {
-    return html`
-      <style>
-        paper-button {
-          color: var(--primary-color);
-          font-weight: 500;
-          margin-right: -0.57em;
-        }
-      </style>
-    `;
-  }
-
-  static get lockControlTemplate() {
-    return html`
-      <paper-button on-click="_callService">
-        [[_computeButtonTitle(_stateObj.state)]]
-      </paper-button>
-    `;
-  }
-
-  static get properties() {
-    return {
-      hass: Object,
-      _config: Object,
-      _stateObj: {
-        type: Object,
-        computed: "_computeStateObj(hass.states, _config.entity)",
-      },
-    };
-  }
-
-  _computeStateObj(states, entityId) {
-    return states && entityId in states ? states[entityId] : null;
-  }
-
-  setConfig(config) {
-    if (!config || !config.entity) {
-      throw new Error("Entity not configured.");
-    }
-    this._config = config;
-  }
-
-  _computeButtonTitle(state) {
-    return state === "locked"
-      ? this.localize("ui.card.lock.unlock")
-      : this.localize("ui.card.lock.lock");
-  }
-
-  _callService(ev) {
-    ev.stopPropagation();
-    const stateObj = this._stateObj;
-    this.hass.callService(
-      "lock",
-      stateObj.state === "locked" ? "unlock" : "lock",
-      { entity_id: stateObj.entity_id }
-    );
-  }
-}
-customElements.define("hui-lock-entity-row", HuiLockEntityRow);
diff --git a/src/panels/lovelace/entity-rows/hui-lock-entity-row.ts b/src/panels/lovelace/entity-rows/hui-lock-entity-row.ts
new file mode 100644
index 0000000000..a63ae52753
--- /dev/null
+++ b/src/panels/lovelace/entity-rows/hui-lock-entity-row.ts
@@ -0,0 +1,88 @@
+import { html, LitElement, PropertyDeclarations } from "@polymer/lit-element";
+import { TemplateResult } from "lit-html";
+
+import "../components/hui-generic-entity-row";
+import "./hui-error-entity-row";
+
+import { hassLocalizeLitMixin } from "../../../mixins/lit-localize-mixin";
+import { HomeAssistant } from "../../../types";
+import { EntityRow, EntityConfig } from "./types";
+
+class HuiLockEntityRow extends hassLocalizeLitMixin(LitElement)
+  implements EntityRow {
+  public hass?: HomeAssistant;
+  private _config?: EntityConfig;
+
+  static get properties(): PropertyDeclarations {
+    return {
+      hass: {},
+      _config: {},
+    };
+  }
+
+  public setConfig(config: EntityConfig): void {
+    if (!config) {
+      throw new Error("Configuration error");
+    }
+    this._config = config;
+  }
+
+  protected render(): TemplateResult {
+    if (!this._config || !this.hass) {
+      return html``;
+    }
+
+    const stateObj = this.hass.states[this._config.entity];
+
+    if (!stateObj) {
+      return html`
+        <hui-error-entity-row
+          .entity="${this._config.entity}"
+        ></hui-error-entity-row>
+      `;
+    }
+
+    return html`
+      ${this.renderStyle()}
+      <hui-generic-entity-row .hass="${this.hass}" .config="${this._config}">
+        <paper-button @click="${this._callService}">
+          ${
+            stateObj.state === "locked"
+              ? this.localize("ui.card.lock.unlock")
+              : this.localize("ui.card.lock.lock")
+          }
+        </paper-button>
+      </hui-generic-entity-row>
+    `;
+  }
+
+  protected renderStyle(): TemplateResult {
+    return html`
+      <style>
+        paper-button {
+          color: var(--primary-color);
+          font-weight: 500;
+          margin-right: -0.57em;
+        }
+      </style>
+    `;
+  }
+
+  private _callService(ev): void {
+    ev.stopPropagation();
+    const stateObj = this.hass!.states[this._config!.entity];
+    this.hass!.callService(
+      "lock",
+      stateObj.state === "locked" ? "unlock" : "lock",
+      { entity_id: stateObj.entity_id }
+    );
+  }
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "hui-lock-entity-row": HuiLockEntityRow;
+  }
+}
+
+customElements.define("hui-lock-entity-row", HuiLockEntityRow);